Statewide Rankings

Parameter:

Year:

Month:

State:

Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Illinois

Average Temperature Rankings, September 2015

View Period (Months):

All

Download: CSV JSON XML

Record Coolest

Bottom ⅒

Bottom ⅓

Normal

Top ⅓

Top ⅒

Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
September 2015 1-Month	70.4°F (21.3°C)	66.2°F (19.0°C)	4.2°F (2.3°C)	119th Coolest	Coolest since: 2014	1918
September 2015 1-Month	70.4°F (21.3°C)	66.2°F (19.0°C)	4.2°F (2.3°C)	10th Warmest	Warmest since: 2005	1925, 1933
Aug–Sep 2015 2-Month	71.2°F (21.8°C)	69.8°F (21.0°C)	1.4°F (0.8°C)	94th Coolest	Coolest since: 2014	1967
	71.2°F (21.8°C)	69.8°F (21.0°C)	1.4°F (0.8°C)	35th Warmest	Warmest since: 2010	1936
	Ties: 1937
Jul–Sep 2015 3-Month	72.2°F (22.3°C)	71.7°F (22.1°C)	0.5°F (0.2°C)	76th Coolest	Coolest since: 2014	1967
	72.2°F (22.3°C)	71.7°F (22.1°C)	0.5°F (0.2°C)	53rd Warmest	Warmest since: 2012	1936
	Ties: 1895, 1970, 1986
Jun–Sep 2015 4-Month	72.1°F (22.3°C)	71.7°F (22.1°C)	0.4°F (0.2°C)	77th Coolest	Coolest since: 2014	1915, 1924
	72.1°F (22.3°C)	71.7°F (22.1°C)	0.4°F (0.2°C)	52nd Warmest	Warmest since: 2012	1936
	Ties: 1971
May–Sep 2015 5-Month	70.6°F (21.4°C)	69.7°F (20.9°C)	0.9°F (0.5°C)	87th Coolest	Coolest since: 2014	1924
	70.6°F (21.4°C)	69.7°F (20.9°C)	0.9°F (0.5°C)	42nd Warmest	Warmest since: 2012	1936
	Ties: 1895
Apr–Sep 2015 6-Month	67.9°F (19.9°C)	66.7°F (19.3°C)	1.2°F (0.6°C)	96th Coolest	Coolest since: 2014	1907
	67.9°F (19.9°C)	66.7°F (19.3°C)	1.2°F (0.6°C)	33rd Warmest	Warmest since: 2012	2010
	Ties: 1944, 1980, 2001, 2021
Mar–Sep 2015 7-Month	63.7°F (17.6°C)	62.9°F (17.2°C)	0.8°F (0.4°C)	90th Coolest	Coolest since: 2014	1924
	63.7°F (17.6°C)	62.9°F (17.2°C)	0.8°F (0.4°C)	39th Warmest	Warmest since: 2012	2012
	Ties: 1919, 1964
Feb–Sep 2015 8-Month	58.1°F (14.5°C)	58.7°F (14.8°C)	-0.6°F (-0.3°C)	42nd Coolest	Coolest since: 2014	1904
	58.1°F (14.5°C)	58.7°F (14.8°C)	-0.6°F (-0.3°C)	87th Warmest	Warmest since: 2012	2012
	Ties: 1900, 1937, 1984, 1997, 2003
Jan–Sep 2015 9-Month	54.5°F (12.5°C)	54.9°F (12.7°C)	-0.4°F (-0.2°C)	48th Coolest	Coolest since: 2014	1904, 1912
	54.5°F (12.5°C)	54.9°F (12.7°C)	-0.4°F (-0.2°C)	81st Warmest	Warmest since: 2013	2012
	Ties: 1916, 1989, 2009
Dec 2014–Sep 2015 10-Month	52.5°F (11.4°C)	52.4°F (11.3°C)	0.1°F (0.1°C)	69th Coolest	Coolest since: 2014	1904
	52.5°F (11.4°C)	52.4°F (11.3°C)	0.1°F (0.1°C)	59th Warmest	Warmest since: 2013	2012
	Ties: 1937, 1948, 1972, 1985, 2011
Nov 2014–Sep 2015 11-Month	50.8°F (10.4°C)	51.4°F (10.8°C)	-0.6°F (-0.4°C)	36th Coolest	Coolest since: 2014	1904
	50.8°F (10.4°C)	51.4°F (10.8°C)	-0.6°F (-0.4°C)	92nd Warmest	Warmest since: 2013	2012
	Ties: 1945, 1950, 1968, 1993, 2003, 2009
Oct 2014–Sep 2015 12-Month	51.1°F (10.6°C)	51.6°F (10.9°C)	-0.5°F (-0.3°C)	38th Coolest	Coolest since: 2014	1904
	51.1°F (10.6°C)	51.6°F (10.9°C)	-0.5°F (-0.3°C)	90th Warmest	Warmest since: 2013	2012
	Ties: 1945, 1961, 1965, 2009
Apr 2014–Sep 2015 18-Month	56.2°F (13.4°C)	56.7°F (13.7°C)	-0.5°F (-0.3°C)	39th Coolest	Coolest since: 2014	1904, 1918
	56.2°F (13.4°C)	56.7°F (13.7°C)	-0.5°F (-0.3°C)	89th Warmest	Warmest since: 2013	2012
	Ties: 1907, 1940
Oct 2013–Sep 2015 24-Month	50.2°F (10.1°C)	51.6°F (10.9°C)	-1.4°F (-0.8°C)	6th Coolest	Coolest since: 1979	1979
Oct 2013–Sep 2015 24-Month	50.2°F (10.1°C)	51.6°F (10.9°C)	-1.4°F (-0.8°C)	121st Warmest	Warmest since: 2014	2017
Oct 2012–Sep 2015 36-Month	50.8°F (10.4°C)	51.6°F (10.9°C)	-0.8°F (-0.5°C)	13th Coolest	Coolest since: 1981	1979
	50.8°F (10.4°C)	51.6°F (10.9°C)	-0.8°F (-0.5°C)	113th Warmest	Warmest since: 2014	2018
	Ties: 1907, 1920, 1960, 1963, 1970, 1971, 1981
Oct 2011–Sep 2015 48-Month	52.2°F (11.2°C)	51.6°F (10.9°C)	0.6°F (0.3°C)	84th Coolest	Coolest since: 2011	1905
	52.2°F (11.2°C)	51.6°F (10.9°C)	0.6°F (0.3°C)	41st Warmest	Warmest since: 2014	2019
	Ties: 1939, 1954
Oct 2010–Sep 2015 60-Month	52.1°F (11.2°C)	51.6°F (10.9°C)	0.5°F (0.3°C)	78th Coolest	Coolest since: 1998	1906
	52.1°F (11.2°C)	51.6°F (10.9°C)	0.5°F (0.3°C)	46th Warmest	Warmest since: 2014	2020
	Ties: 1937, 1938, 1945, 1954, 1993

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2023, retrieved on March 21, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings